Make the indent level of clojure docstrings configurable via
clojure-docstring-indent-level. Current default value is 2, but I would
argue most clojure projects indent to 3 (aligning subsequent lines with
the first letter of the docstring rather than the quote mark).
Set default docstring indent margin to 2 for backwards compatibility
Merge pull request #174 from AdamClements/master

Configurable docstring margin